무족화 첩 광섬유 격자 재구성을 위한 혼합 최적화 방법
Hybrid Optimization Method for the Reconstruction of Apodized Chirped Fiber Bragg Gratings
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참고문헌
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초록
광섬유 격자의 반사스펙트럼을 분석하여 무족화 첩 광섬유 격자를 재구성하는 혼합 최적화 방법을 제안한다. 반사 스펙트럼의 힐버트 변환을 사용하여 설계 변수들의 추정값을 결정하고 층분리 알고리즘을 활용한 차분진화 최적화를 통하여 격자의 설계 변수들을 최종 확정하였다. 특성 격자 주기 변화율 2 nm/cm인 무족화 첩 격자에 대한 계산 결과는 격자주기 변화율에 대해 6× 10-5nm/cm, 굴절률 변조에 대해 3 × 10-9의 정확도로 설계 변수를 재구성할 수 있었으며 종래의 최적화 방법에 비하여 신속성과 신뢰성을 개선할 수 있음을 확인하였다.
Abstract
We have studied the hybrid method for reconstructing apodized chirped fiber Bragg gratings, using both an analytic estimationof grating parameters and an optimization algorithm. The Hilbert transform of the reflection spectrum was utilized to estimate gratingparameters, and then the layer-peeling algorithm was used to obtain refined parameter values by the differential-evolutionoptimization process. Calculations for a fiber Bragg grating with wavelength chirp rate 2 nm/cm were obtained with an accuracyof 6 × 10-5nm/cm for the chirp rate and 3 × 10-9for the index modulation, with much improved calculation speed and highreliability.
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